Tariffs shouldn’t prevent buying stuff, you just have to, y’know, pay a tariff on import.
In this case, a Japanese made camera will incur a 15% tariff.
I just checked and you can still send goods between Japan and the US. There are still merchants selling the exact mentioned camera on eBay that will ship to the US.
Here is the exact camera mentioned, offered by a Japanese seller, that will ship to the United States: https://www.ebay.com/itm/317445808304
Can you source your claim that absolutely no courier is capable of shipping goods into the US? I can’t find anything using google, or on any courier websites.
FedEx does have information about how to correctly fill out the forms for the purposes of tariffs, but does not mention that they will not accept shipments.
Many of the postal and courier systems that suspended service have since set up the systems they need, and are happily moving packages into the US, but it tends not to make the news.